Commit | Line | Data |
---|---|---|
dfb346d0 | 1 | /* ip_input.c 1.34 82/03/23 */ |
6e8b2eca | 2 | |
e1d82856 | 3 | #include "../h/param.h" |
d10bd5b7 | 4 | #include "../h/systm.h" |
e6dd2097 BJ |
5 | #include "../h/clock.h" |
6 | #include "../h/mbuf.h" | |
eb44bfb2 | 7 | #include "../h/protosw.h" |
2b4b57cd | 8 | #include "../h/socket.h" |
8a13b737 BJ |
9 | #include "../net/in.h" |
10 | #include "../net/in_systm.h" | |
4ad99bae | 11 | #include "../net/if.h" |
8a13b737 | 12 | #include "../net/ip.h" /* belongs before in.h */ |
eb44bfb2 | 13 | #include "../net/ip_var.h" |
d52566dd BJ |
14 | #include "../net/ip_icmp.h" |
15 | #include "../net/tcp.h" | |
e6dd2097 | 16 | |
eb44bfb2 | 17 | u_char ip_protox[IPPROTO_MAX]; |
1e977657 | 18 | int ipqmaxlen = IFQ_MAXLEN; |
eb44bfb2 | 19 | |
d52566dd | 20 | /* |
b454c3ea | 21 | * IP initialization: fill in IP protocol switch table. |
405c9168 | 22 | * All protocols not implemented in kernel go to raw IP protocol handler. |
d52566dd BJ |
23 | */ |
24 | ip_init() | |
25 | { | |
eb44bfb2 BJ |
26 | register struct protosw *pr; |
27 | register int i; | |
eb44bfb2 | 28 | |
4ad99bae | 29 | COUNT(IP_INIT); |
eb44bfb2 BJ |
30 | pr = pffindproto(PF_INET, IPPROTO_RAW); |
31 | if (pr == 0) | |
32 | panic("ip_init"); | |
33 | for (i = 0; i < IPPROTO_MAX; i++) | |
34 | ip_protox[i] = pr - protosw; | |
35 | for (pr = protosw; pr <= protoswLAST; pr++) | |
36 | if (pr->pr_family == PF_INET && | |
37 | pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) | |
38 | ip_protox[pr->pr_protocol] = pr - protosw; | |
d52566dd BJ |
39 | ipq.next = ipq.prev = &ipq; |
40 | ip_id = time & 0xffff; | |
1e977657 | 41 | ipintrq.ifq_maxlen = ipqmaxlen; |
d52566dd BJ |
42 | } |
43 | ||
eb44bfb2 | 44 | u_char ipcksum = 1; |
e6dd2097 BJ |
45 | struct ip *ip_reass(); |
46 | ||
e6dd2097 BJ |
47 | /* |
48 | * Ip input routine. Checksum and byte swap header. If fragmented | |
49 | * try to reassamble. If complete and fragment queue exists, discard. | |
50 | * Process options. Pass to next level. | |
51 | */ | |
8a13b737 | 52 | ipintr() |
e1d82856 | 53 | { |
2b4b57cd | 54 | register struct ip *ip; |
8a13b737 | 55 | register struct mbuf *m; |
7c08c626 | 56 | struct mbuf *m0, *mopt; |
e6dd2097 | 57 | register int i; |
e1d82856 | 58 | register struct ipq *fp; |
8a13b737 | 59 | int hlen, s; |
e1d82856 | 60 | |
8a13b737 BJ |
61 | COUNT(IPINTR); |
62 | next: | |
e6dd2097 | 63 | /* |
8a13b737 BJ |
64 | * Get next datagram off input queue and get IP header |
65 | * in first mbuf. | |
e6dd2097 | 66 | */ |
8a13b737 BJ |
67 | s = splimp(); |
68 | IF_DEQUEUE(&ipintrq, m); | |
69 | splx(s); | |
7ac98d3c | 70 | if (m == 0) |
8a13b737 | 71 | return; |
9411b6be BJ |
72 | if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct ip)) && |
73 | (m = m_pullup(m, sizeof (struct ip))) == 0) | |
74 | return; | |
e6dd2097 | 75 | ip = mtod(m, struct ip *); |
405c9168 | 76 | if ((hlen = ip->ip_hl << 2) > m->m_len) { |
9411b6be BJ |
77 | if ((m = m_pullup(m, hlen)) == 0) |
78 | return; | |
405c9168 BJ |
79 | ip = mtod(m, struct ip *); |
80 | } | |
4ad99bae | 81 | if (ipcksum) |
7c08c626 | 82 | if (ip->ip_sum = in_cksum(m, hlen)) { |
405c9168 | 83 | printf("ip_sum %x\n", ip->ip_sum); /* XXX */ |
4ad99bae BJ |
84 | ipstat.ips_badsum++; |
85 | goto bad; | |
e1d82856 | 86 | } |
4ad99bae | 87 | |
7c08c626 | 88 | #if vax |
4ad99bae BJ |
89 | /* |
90 | * Convert fields to host representation. | |
91 | */ | |
cdad2eb1 | 92 | ip->ip_len = ntohs((u_short)ip->ip_len); |
e6dd2097 | 93 | ip->ip_id = ntohs(ip->ip_id); |
4ad99bae | 94 | ip->ip_off = ntohs((u_short)ip->ip_off); |
7c08c626 | 95 | #endif |
e1d82856 | 96 | |
d10bd5b7 | 97 | /* |
e6dd2097 BJ |
98 | * Check that the amount of data in the buffers |
99 | * is as at least much as the IP header would have us expect. | |
100 | * Trim mbufs if longer than we expect. | |
101 | * Drop packet if shorter than we expect. | |
d10bd5b7 | 102 | */ |
e6dd2097 | 103 | i = 0; |
405c9168 | 104 | m0 = m; |
1dd55890 BJ |
105 | for (; m != NULL; m = m->m_next) { |
106 | if (m->m_free) panic("ipinput already free"); | |
e1d82856 | 107 | i += m->m_len; |
1dd55890 | 108 | } |
e6dd2097 BJ |
109 | m = m0; |
110 | if (i != ip->ip_len) { | |
405c9168 BJ |
111 | if (i < ip->ip_len) { |
112 | ipstat.ips_tooshort++; | |
4ad99bae | 113 | goto bad; |
405c9168 | 114 | } |
e6dd2097 | 115 | m_adj(m, ip->ip_len - i); |
d10bd5b7 | 116 | } |
e1d82856 | 117 | |
e6dd2097 BJ |
118 | /* |
119 | * Process options and, if not destined for us, | |
120 | * ship it on. | |
121 | */ | |
122 | if (hlen > sizeof (struct ip)) | |
cdad2eb1 | 123 | ip_dooptions(ip); |
8a13b737 | 124 | if (ifnet && ip->ip_dst.s_addr != ifnet->if_addr.s_addr && |
92c7b8c1 | 125 | if_ifwithaddr(ip->ip_dst) == 0) { |
1e977657 BJ |
126 | |
127 | goto bad; | |
128 | #ifdef notdef | |
129 | printf("ip->ip_dst %x ip->ip_ttl %x\n", | |
130 | ip->ip_dst, ip->ip_ttl); | |
e6dd2097 | 131 | if (--ip->ip_ttl == 0) { |
cdad2eb1 | 132 | icmp_error(ip, ICMP_TIMXCEED, 0); |
8a13b737 | 133 | goto next; |
e6dd2097 | 134 | } |
7c08c626 BJ |
135 | mopt = m_get(M_DONTWAIT); |
136 | if (mopt == 0) | |
137 | goto bad; | |
138 | ip_stripoptions(ip, mopt); | |
1e977657 BJ |
139 | /* 0 here means no directed broadcast */ |
140 | (void) ip_output(m0, mopt, 0); | |
8a13b737 | 141 | goto next; |
1e977657 | 142 | #endif |
d10bd5b7 | 143 | } |
e1d82856 | 144 | |
e6dd2097 BJ |
145 | /* |
146 | * Look for queue of fragments | |
147 | * of this datagram. | |
148 | */ | |
149 | for (fp = ipq.next; fp != &ipq; fp = fp->next) | |
150 | if (ip->ip_id == fp->ipq_id && | |
151 | ip->ip_src.s_addr == fp->ipq_src.s_addr && | |
152 | ip->ip_dst.s_addr == fp->ipq_dst.s_addr && | |
153 | ip->ip_p == fp->ipq_p) | |
154 | goto found; | |
155 | fp = 0; | |
156 | found: | |
e1d82856 | 157 | |
e6dd2097 BJ |
158 | /* |
159 | * Adjust ip_len to not reflect header, | |
160 | * set ip_mff if more fragments are expected, | |
161 | * convert offset of this to bytes. | |
162 | */ | |
163 | ip->ip_len -= hlen; | |
eb44bfb2 | 164 | ((struct ipasfrag *)ip)->ipf_mff = 0; |
e6dd2097 | 165 | if (ip->ip_off & IP_MF) |
eb44bfb2 | 166 | ((struct ipasfrag *)ip)->ipf_mff = 1; |
e6dd2097 | 167 | ip->ip_off <<= 3; |
e1d82856 | 168 | |
e6dd2097 BJ |
169 | /* |
170 | * If datagram marked as having more fragments | |
171 | * or if this is not the first fragment, | |
172 | * attempt reassembly; if it succeeds, proceed. | |
173 | */ | |
eb44bfb2 BJ |
174 | if (((struct ipasfrag *)ip)->ipf_mff || ip->ip_off) { |
175 | ip = ip_reass((struct ipasfrag *)ip, fp); | |
e6dd2097 | 176 | if (ip == 0) |
8a13b737 | 177 | goto next; |
e6dd2097 BJ |
178 | hlen = ip->ip_hl << 2; |
179 | m = dtom(ip); | |
180 | } else | |
181 | if (fp) | |
182 | (void) ip_freef(fp); | |
4ad99bae BJ |
183 | |
184 | /* | |
185 | * Switch out to protocol's input routine. | |
186 | */ | |
eb44bfb2 | 187 | (*protosw[ip_protox[ip->ip_p]].pr_input)(m); |
8a13b737 | 188 | goto next; |
4ad99bae BJ |
189 | bad: |
190 | m_freem(m); | |
8a13b737 | 191 | goto next; |
e6dd2097 | 192 | } |
e1d82856 | 193 | |
e6dd2097 BJ |
194 | /* |
195 | * Take incoming datagram fragment and try to | |
4ad99bae | 196 | * reassemble it into whole datagram. If a chain for |
e6dd2097 BJ |
197 | * reassembly of this datagram already exists, then it |
198 | * is given as fp; otherwise have to make a chain. | |
199 | */ | |
200 | struct ip * | |
201 | ip_reass(ip, fp) | |
eb44bfb2 | 202 | register struct ipasfrag *ip; |
e6dd2097 BJ |
203 | register struct ipq *fp; |
204 | { | |
205 | register struct mbuf *m = dtom(ip); | |
eb44bfb2 | 206 | register struct ipasfrag *q; |
e6dd2097 BJ |
207 | struct mbuf *t; |
208 | int hlen = ip->ip_hl << 2; | |
209 | int i, next; | |
4ad99bae | 210 | COUNT(IP_REASS); |
d10bd5b7 | 211 | |
e6dd2097 BJ |
212 | /* |
213 | * Presence of header sizes in mbufs | |
214 | * would confuse code below. | |
215 | */ | |
216 | m->m_off += hlen; | |
217 | m->m_len -= hlen; | |
d10bd5b7 | 218 | |
e6dd2097 BJ |
219 | /* |
220 | * If first fragment to arrive, create a reassembly queue. | |
221 | */ | |
222 | if (fp == 0) { | |
e6b33a03 | 223 | if ((t = m_get(M_WAIT)) == NULL) |
e6dd2097 BJ |
224 | goto dropfrag; |
225 | t->m_off = MMINOFF; | |
226 | fp = mtod(t, struct ipq *); | |
227 | insque(fp, &ipq); | |
228 | fp->ipq_ttl = IPFRAGTTL; | |
229 | fp->ipq_p = ip->ip_p; | |
230 | fp->ipq_id = ip->ip_id; | |
eb44bfb2 BJ |
231 | fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp; |
232 | fp->ipq_src = ((struct ip *)ip)->ip_src; | |
233 | fp->ipq_dst = ((struct ip *)ip)->ip_dst; | |
405c9168 BJ |
234 | q = (struct ipasfrag *)fp; |
235 | goto insert; | |
e6dd2097 | 236 | } |
e1d82856 | 237 | |
e6dd2097 BJ |
238 | /* |
239 | * Find a segment which begins after this one does. | |
240 | */ | |
eb44bfb2 | 241 | for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) |
e6dd2097 BJ |
242 | if (q->ip_off > ip->ip_off) |
243 | break; | |
e1d82856 | 244 | |
e6dd2097 BJ |
245 | /* |
246 | * If there is a preceding segment, it may provide some of | |
247 | * our data already. If so, drop the data from the incoming | |
248 | * segment. If it provides all of our data, drop us. | |
249 | */ | |
eb44bfb2 BJ |
250 | if (q->ipf_prev != (struct ipasfrag *)fp) { |
251 | i = q->ipf_prev->ip_off + q->ipf_prev->ip_len - ip->ip_off; | |
e6dd2097 BJ |
252 | if (i > 0) { |
253 | if (i >= ip->ip_len) | |
254 | goto dropfrag; | |
255 | m_adj(dtom(ip), i); | |
256 | ip->ip_off += i; | |
257 | ip->ip_len -= i; | |
e1d82856 | 258 | } |
d10bd5b7 | 259 | } |
e1d82856 | 260 | |
e6dd2097 BJ |
261 | /* |
262 | * While we overlap succeeding segments trim them or, | |
263 | * if they are completely covered, dequeue them. | |
264 | */ | |
eb44bfb2 | 265 | while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { |
e6dd2097 BJ |
266 | i = (ip->ip_off + ip->ip_len) - q->ip_off; |
267 | if (i < q->ip_len) { | |
268 | q->ip_len -= i; | |
c107df34 | 269 | q->ip_off += i; |
e6dd2097 BJ |
270 | m_adj(dtom(q), i); |
271 | break; | |
272 | } | |
eb44bfb2 BJ |
273 | q = q->ipf_next; |
274 | m_freem(dtom(q->ipf_prev)); | |
275 | ip_deq(q->ipf_prev); | |
e6dd2097 | 276 | } |
e1d82856 | 277 | |
405c9168 | 278 | insert: |
e6dd2097 BJ |
279 | /* |
280 | * Stick new segment in its place; | |
281 | * check for complete reassembly. | |
282 | */ | |
eb44bfb2 | 283 | ip_enq(ip, q->ipf_prev); |
e6dd2097 | 284 | next = 0; |
eb44bfb2 | 285 | for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) { |
e6dd2097 BJ |
286 | if (q->ip_off != next) |
287 | return (0); | |
288 | next += q->ip_len; | |
289 | } | |
eb44bfb2 | 290 | if (q->ipf_prev->ipf_mff) |
e6dd2097 | 291 | return (0); |
e1d82856 | 292 | |
e6dd2097 BJ |
293 | /* |
294 | * Reassembly is complete; concatenate fragments. | |
295 | */ | |
296 | q = fp->ipq_next; | |
297 | m = dtom(q); | |
298 | t = m->m_next; | |
299 | m->m_next = 0; | |
300 | m_cat(m, t); | |
dfb346d0 BJ |
301 | q = q->ipf_next; |
302 | while (q != (struct ipasfrag *)fp) { | |
303 | t = dtom(q); | |
304 | q = q->ipf_next; | |
305 | m_cat(m, t); | |
306 | } | |
e1d82856 | 307 | |
e6dd2097 BJ |
308 | /* |
309 | * Create header for new ip packet by | |
310 | * modifying header of first packet; | |
311 | * dequeue and discard fragment reassembly header. | |
312 | * Make header visible. | |
313 | */ | |
314 | ip = fp->ipq_next; | |
315 | ip->ip_len = next; | |
eb44bfb2 BJ |
316 | ((struct ip *)ip)->ip_src = fp->ipq_src; |
317 | ((struct ip *)ip)->ip_dst = fp->ipq_dst; | |
e6dd2097 | 318 | remque(fp); |
cdad2eb1 | 319 | (void) m_free(dtom(fp)); |
e6dd2097 | 320 | m = dtom(ip); |
eb44bfb2 BJ |
321 | m->m_len += sizeof (struct ipasfrag); |
322 | m->m_off -= sizeof (struct ipasfrag); | |
323 | return ((struct ip *)ip); | |
e6dd2097 BJ |
324 | |
325 | dropfrag: | |
326 | m_freem(m); | |
327 | return (0); | |
e1d82856 BJ |
328 | } |
329 | ||
e6dd2097 BJ |
330 | /* |
331 | * Free a fragment reassembly header and all | |
332 | * associated datagrams. | |
333 | */ | |
334 | struct ipq * | |
335 | ip_freef(fp) | |
336 | struct ipq *fp; | |
e1d82856 | 337 | { |
eb44bfb2 | 338 | register struct ipasfrag *q; |
e6dd2097 | 339 | struct mbuf *m; |
4ad99bae | 340 | COUNT(IP_FREEF); |
e6dd2097 | 341 | |
eb44bfb2 | 342 | for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) |
e6dd2097 BJ |
343 | m_freem(dtom(q)); |
344 | m = dtom(fp); | |
345 | fp = fp->next; | |
346 | remque(fp->prev); | |
cdad2eb1 | 347 | (void) m_free(m); |
e6dd2097 | 348 | return (fp); |
e1d82856 BJ |
349 | } |
350 | ||
e6dd2097 BJ |
351 | /* |
352 | * Put an ip fragment on a reassembly chain. | |
353 | * Like insque, but pointers in middle of structure. | |
354 | */ | |
355 | ip_enq(p, prev) | |
eb44bfb2 | 356 | register struct ipasfrag *p, *prev; |
e1d82856 | 357 | { |
e1d82856 | 358 | |
4ad99bae | 359 | COUNT(IP_ENQ); |
eb44bfb2 BJ |
360 | p->ipf_prev = prev; |
361 | p->ipf_next = prev->ipf_next; | |
362 | prev->ipf_next->ipf_prev = p; | |
363 | prev->ipf_next = p; | |
e1d82856 BJ |
364 | } |
365 | ||
e6dd2097 BJ |
366 | /* |
367 | * To ip_enq as remque is to insque. | |
368 | */ | |
369 | ip_deq(p) | |
eb44bfb2 | 370 | register struct ipasfrag *p; |
e1d82856 | 371 | { |
e6dd2097 | 372 | |
4ad99bae | 373 | COUNT(IP_DEQ); |
eb44bfb2 BJ |
374 | p->ipf_prev->ipf_next = p->ipf_next; |
375 | p->ipf_next->ipf_prev = p->ipf_prev; | |
e1d82856 BJ |
376 | } |
377 | ||
e6dd2097 BJ |
378 | /* |
379 | * IP timer processing; | |
380 | * if a timer expires on a reassembly | |
381 | * queue, discard it. | |
382 | */ | |
d52566dd | 383 | ip_slowtimo() |
e1d82856 BJ |
384 | { |
385 | register struct ipq *fp; | |
e6dd2097 | 386 | int s = splnet(); |
e1d82856 | 387 | |
4ad99bae | 388 | COUNT(IP_SLOWTIMO); |
4aed14e3 BJ |
389 | fp = ipq.next; |
390 | if (fp == 0) { | |
391 | splx(s); | |
392 | return; | |
393 | } | |
394 | while (fp != &ipq) | |
e6dd2097 BJ |
395 | if (--fp->ipq_ttl == 0) |
396 | fp = ip_freef(fp); | |
397 | else | |
398 | fp = fp->next; | |
e6dd2097 | 399 | splx(s); |
e1d82856 BJ |
400 | } |
401 | ||
4ad99bae BJ |
402 | /* |
403 | * Drain off all datagram fragments. | |
404 | */ | |
d52566dd BJ |
405 | ip_drain() |
406 | { | |
407 | ||
4ad99bae BJ |
408 | COUNT(IP_DRAIN); |
409 | while (ipq.next != &ipq) | |
410 | (void) ip_freef(ipq.next); | |
d52566dd | 411 | } |
2b4b57cd | 412 | |
e6dd2097 BJ |
413 | /* |
414 | * Do option processing on a datagram, | |
415 | * possibly discarding it if bad options | |
416 | * are encountered. | |
417 | */ | |
418 | ip_dooptions(ip) | |
419 | struct ip *ip; | |
e1d82856 | 420 | { |
e6dd2097 | 421 | register u_char *cp; |
cdad2eb1 | 422 | int opt, optlen, cnt; |
2b4b57cd | 423 | struct in_addr *sin; |
d52566dd | 424 | register struct ip_timestamp *ipt; |
4ad99bae BJ |
425 | register struct ifnet *ifp; |
426 | struct in_addr t; | |
e6dd2097 | 427 | |
4ad99bae | 428 | COUNT(IP_DOOPTIONS); |
e6dd2097 BJ |
429 | cp = (u_char *)(ip + 1); |
430 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); | |
431 | for (; cnt > 0; cnt -= optlen, cp += optlen) { | |
432 | opt = cp[0]; | |
433 | if (opt == IPOPT_EOL) | |
434 | break; | |
435 | if (opt == IPOPT_NOP) | |
436 | optlen = 1; | |
437 | else | |
438 | optlen = cp[1]; | |
439 | switch (opt) { | |
e1d82856 | 440 | |
e6dd2097 BJ |
441 | default: |
442 | break; | |
e1d82856 | 443 | |
4ad99bae BJ |
444 | /* |
445 | * Source routing with record. | |
446 | * Find interface with current destination address. | |
447 | * If none on this machine then drop if strictly routed, | |
448 | * or do nothing if loosely routed. | |
449 | * Record interface address and bring up next address | |
450 | * component. If strictly routed make sure next | |
451 | * address on directly accessible net. | |
452 | */ | |
e6dd2097 | 453 | case IPOPT_LSRR: |
d52566dd | 454 | if (cp[2] < 4 || cp[2] > optlen - (sizeof (long) - 1)) |
e6dd2097 | 455 | break; |
2b4b57cd | 456 | sin = (struct in_addr *)(cp + cp[2]); |
4ad99bae BJ |
457 | ifp = if_ifwithaddr(*sin); |
458 | if (ifp == 0) { | |
459 | if (opt == IPOPT_SSRR) | |
460 | goto bad; | |
461 | break; | |
e6dd2097 | 462 | } |
4ad99bae BJ |
463 | t = ip->ip_dst; ip->ip_dst = *sin; *sin = t; |
464 | cp[2] += 4; | |
465 | if (cp[2] > optlen - (sizeof (long) - 1)) | |
466 | break; | |
467 | ip->ip_dst = sin[1]; | |
468 | if (opt == IPOPT_SSRR && if_ifonnetof(ip->ip_dst)==0) | |
469 | goto bad; | |
e6dd2097 BJ |
470 | break; |
471 | ||
472 | case IPOPT_TS: | |
d52566dd BJ |
473 | ipt = (struct ip_timestamp *)cp; |
474 | if (ipt->ipt_len < 5) | |
e6dd2097 | 475 | goto bad; |
d52566dd BJ |
476 | if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { |
477 | if (++ipt->ipt_oflw == 0) | |
e6dd2097 | 478 | goto bad; |
e6dd2097 BJ |
479 | break; |
480 | } | |
2b4b57cd | 481 | sin = (struct in_addr *)(cp+cp[2]); |
d52566dd | 482 | switch (ipt->ipt_flg) { |
e1d82856 | 483 | |
e6dd2097 BJ |
484 | case IPOPT_TS_TSONLY: |
485 | break; | |
e1d82856 | 486 | |
e6dd2097 | 487 | case IPOPT_TS_TSANDADDR: |
d52566dd | 488 | if (ipt->ipt_ptr + 8 > ipt->ipt_len) |
e6dd2097 | 489 | goto bad; |
4ad99bae BJ |
490 | /* stamp with ``first'' interface address */ |
491 | *sin++ = ifnet->if_addr; | |
e6dd2097 BJ |
492 | break; |
493 | ||
494 | case IPOPT_TS_PRESPEC: | |
4ad99bae BJ |
495 | if (if_ifwithaddr(*sin) == 0) |
496 | continue; | |
d52566dd | 497 | if (ipt->ipt_ptr + 8 > ipt->ipt_len) |
e6dd2097 | 498 | goto bad; |
d52566dd | 499 | ipt->ipt_ptr += 4; |
e1d82856 BJ |
500 | break; |
501 | ||
502 | default: | |
e6dd2097 | 503 | goto bad; |
e1d82856 | 504 | } |
2b4b57cd | 505 | *(n_time *)sin = iptime(); |
d52566dd | 506 | ipt->ipt_ptr += 4; |
e6dd2097 | 507 | } |
e1d82856 | 508 | } |
cdad2eb1 | 509 | return; |
e6dd2097 BJ |
510 | bad: |
511 | /* SHOULD FORCE ICMP MESSAGE */ | |
cdad2eb1 | 512 | return; |
e1d82856 BJ |
513 | } |
514 | ||
e6dd2097 | 515 | /* |
4ad99bae BJ |
516 | * Strip out IP options, at higher |
517 | * level protocol in the kernel. | |
518 | * Second argument is buffer to which options | |
519 | * will be moved, and return value is their length. | |
e6dd2097 | 520 | */ |
7c08c626 | 521 | ip_stripoptions(ip, mopt) |
e6dd2097 | 522 | struct ip *ip; |
7c08c626 | 523 | struct mbuf *mopt; |
e1d82856 | 524 | { |
e6dd2097 BJ |
525 | register int i; |
526 | register struct mbuf *m; | |
e6dd2097 | 527 | int olen; |
4ad99bae | 528 | COUNT(IP_STRIPOPTIONS); |
e6dd2097 BJ |
529 | |
530 | olen = (ip->ip_hl<<2) - sizeof (struct ip); | |
4ad99bae BJ |
531 | m = dtom(ip); |
532 | ip++; | |
7c08c626 BJ |
533 | if (mopt) { |
534 | mopt->m_len = olen; | |
535 | mopt->m_off = MMINOFF; | |
536 | bcopy((caddr_t)ip, mtod(m, caddr_t), (unsigned)olen); | |
537 | } | |
e6dd2097 | 538 | i = m->m_len - (sizeof (struct ip) + olen); |
cdad2eb1 | 539 | bcopy((caddr_t)ip+olen, (caddr_t)ip, (unsigned)i); |
4aed14e3 | 540 | m->m_len -= olen; |
e1d82856 | 541 | } |